Doepfer A-138M

Matrix Mixer

  • With 4 rows and 4 columns
  • Unipolar / Bipolar mode switchable on each column
  • Suitable for both control voltage and audio
  • Width: 20 HP
  • Depth: 20 mm
  • Power requirements: +30 mA (+12 V) / -30 mA (-12 V)

Further Information

Modul Type Mono
Width 20 TE / HP
17 Customer Ratings:
  • 5
  • 4
  • 3
  • 2
  • 1
4.7 /5
  • handling
  • features
  • quality
Total
Did you know it can also work as a sequencer?
11.01.2016
What an essential and often overlooked module! Besides its obvious use for mixing audio and CV signals, Doepfer A-138M matrix mixer can also function as a sequencer: you can turn it into a 4 step chord sequencer (4 note chords!) or a 16 step traditional sequencer by adding a few additional modules. Feed gate outs 1-4 from either A-152 or A-161 into each respective input. Send each output to 1V/Oct inputs of your 4 VCOs. Play with a clock divider to find the right pace. Or do the same, but connect outputs into an A-151 and then into a VCO. Now you've got 16 steps! As always, very impressed with Doepfer.
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Total
handling
features
quality
Awesome
spewie, 23.08.2020
Such an iconic module for CV mixing mangling in all manner of ways. In bipolar is hard to achieve 0 volts though in the unipolar mode O is more achievable, which would be my only criticsm although I have heard that achieving absolute 0 in a bipolar arrangement is intensely difficult and may not be a reasonable expectation of this module. You always get some bleed due to this problem which is not always an issue, sometimes annoying.
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Total
The heart of my sequencing rig
25.05.2016
This unit is exceptionally useful.
As a straight forward mixer, you can mix up to four signals and route them to four separate outputs, and each output can be set independently to sum the signals in a unipolar (positive voltage only) or bi-polar (positive and negative) fashion. Leaving the first input unplugged also allows you to add an offset to each output via the top row of knobs - very useful!
Where this unit comes into its own however is as a sequencer - you can create four separate sequences from the same input voltages - which can then be used to drive four oscillators to give some nice chords, or if you add an A-151 sequential switch (recommended!) you can create much longer and more complex sequences by switching between the outputs and sending them to one oscillator.

You can also mix LFOs / envelopes etc to create interesting and evolving modulation sources.
You can even (very carefully!) feed the outputs back into the mixer and use it for 'zero-input-mixer' music (disclaimer - feedback is tricky to control! Be careful!)

The usual high Doepfer standards apply here, the perfect blend of affordability and usability.
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Total
handling
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Good module
exmojoao, 19.02.2020
Is a good sounding matrix mixer
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Show variations of this product
Doepfer A-138M
(17)
Doepfer A-138M
to the product
138 €

Matrix Mixer With 4 rows and 4 columns, Unipolar / Bipolar mode switchable on each column, Suitable for both control voltage and audio, Width: 20 HP, Depth: 20 mm, Power requirements: +30 mA (+12...

  • Modul Type: Mono
  • Module: Yes
  • Empty Rack, Or Housing: No
  • Width: 20 TE / HP
  • Basic System: No
  • Accessories: No
Doepfer A-160-2 Clock Divider II
(21)
Doepfer A-160-2 Clock Divider II

Frequency Divider For clock/trigger/gate signals, Width: 4 TE/ 4 HP / 20 mm

  • Width: 4 TE / HP
  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-180-2 Multiples
(86)
Doepfer A-180-2 Multiples

Passive Multi-Port Distributor 8x Interconnected jacks, Sockets are divided into 2x quadruple groups; but can also be modified to an eight-multiple (soldering bridge on the circuit board), Width:...

  • Width: 2 TE / HP
  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-124 Wasp Filter SE
(65)
Doepfer A-124 Wasp Filter SE

Wasp Filter Special edition, Special 12 dB multimode filter, Circuit technology of the "EDP Wasp", Black front, Yellow pot caps, Width: 8 HP, Depth: 45 mm, Power requirements: +30 mA (+12 V)/-10 mA...

  • Width: 8 TE / HP
  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-138s Mini Stereo Mixer
(46)
Doepfer A-138s Mini Stereo Mixer

Mini Stereo Mixer 4-in-2 mix module in Eurorack format, Four inputs with attenuator and pan control, plus two 3.5 mm mini jack outputs, Width: 8 HP, Depth: 30 mm, Power requirements: +10 mA (+12 V)...

  • Modul Type: Stereo
  • Module: Yes
  • Empty Rack, Or Housing: No
  • Width: 8 TE / HP
  • Basic System: No
  • Accessories: No
Doepfer A-138n
(17)
Doepfer A-138n

Eurorack Module Compact 4-channel mixer, Suitable for CV and audio signals, Volume control per channel, 4 Inputs, 2 Mix outputs, Power requirements: +10 mA (+12 V) / -10 mA (-12 V), Width: 4 HP,...

  • Modul Type: Mono
  • Width: 4 TE / HP
Doepfer A-198 (Module + Manual)
(8)
Doepfer A-198 (Module + Manual)
to the product
211 €

Trautonium Controller Consists of Doepfer A-198 Module and Ribbon Controller, Ribbon Controller: Generates a control voltage for the pitch of the oscillators by touching the position sensor,...

  • Width: 8 TE / HP
  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-180-3 Dual Buffered Multiple
(34)
Doepfer A-180-3 Dual Buffered Multiple

Synthesizer module Double buffered 1-in-3 multiple, For buffering and duplication of CV and audio signals, Width: 4 TE / 4HP / 20.0 mm

  • Width: 4 TE / HP
  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-178 Theremin
(23)
Doepfer A-178 Theremin

Theremin Module Produces variable control voltage when hand is moved around the antenna, Range approx. 30 cm, Maximum output voltage: 10V, Euro rack format, Power requirements: 60 MA (+12 V) / 20...

  • Width: 8 TE / HP
  • Module: Yes
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Accessories: No
Doepfer A-156
(39)
Doepfer A-156
to the product
119 €

Dual Quantiser The A-156 Module is a dual control voltage quantiser. A quantiser converts a continuous input control voltage in the range of 0 ... 10V into a stepped output voltage in the same...

  • Switch Modul: No
  • Module: Yes
  • CV-Editor/VC-Processor: Yes
  • Tools: No
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Width: 8 TE / HP
  • Accessories: No
Doepfer A-199 Spring Reverb Module
(55)
Doepfer A-199 Spring Reverb Module
to the product
119 €

Spring reverb module The Doepfer A-199 is a spring reverb module that via the aid of spiral springs electronically reproduces the reverb effect. Spring system with 3 separate springs, Reverb...

  • Reverb: Yes
  • Delay: No
  • Module: Yes
  • Empty Rack, Or Housing: No
  • Multieffect: No
  • Misc. Effects: No
  • Basic System: No
  • Width: 8 TE / HP
  • Accessories: No
Doepfer A-156 Vintage Edition
(16)
Doepfer A-156 Vintage Edition
to the product
127 €

Dual Control Voltage Quantizer Vintage edition with black front plate, Converts a continuous input voltage into a stepped output voltage, Eurorack format, Width: 8 HP, Depth: 55 mm, Power...

  • Switch Modul: No
  • CV-Editor/VC-Processor: Yes
  • Module: Yes
  • Tools: No
  • Empty Rack, Or Housing: No
  • Basic System: No
  • Width: 8 TE / HP
  • Accessories: No
138 €
Including VAT; Excluding 20 € shipping
Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

Standard Delivery Times

Delivery approx. between Tuesday, 1.12. and Wednesday, 2.12.

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